Point-and-Shake: Selecting from Levitating Object Displays
summary
A prototype acoustic levitation rig uses facing ultrasound transducers to hold ~2 mm polystyrene beads and moves them for feedback; selection uses ray-cast pointing with a 1 s dwell or a locking gesture and visual feedback by rapidly moving beads side-to-side. Evaluation reports Point-and-Shake succeeds: first study 96% accuracy and 4.1 s mean selection, second handles occlusion with 95% accuracy and 3 s. Practical constraints include acoustic levitation spacing (≥5 mm) and a recommended 10 mm targets for usability.
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